Sildenafil

How and when to take sildenafil

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It's important to take sildenafil as advised by a doctor or pharmacist. Adhering to your healthcare provider's instructions is crucial for both safety and effectiveness.

Dosage and strength for erectile dysfunction

Sildenafil tablets for erectile dysfunction come in various strengths ranging from 25mg to 100mg, allowing flexibility for individual needs.

The usual dose is 50mg, taken as needed. It is important to remember not to exceed one dose in any 24-hour period.

Depending on how sildenafil affects you, the dose can be adjusted, with a potential increase to 100mg or a decrease to 25mg as necessary.

For optimal effectiveness, take sildenafil up to 4 hours before sexual activity, ensuring you are sexually aroused for it to work properly.

Dosage and strength for pulmonary hypertension

Sildenafil tablets for pulmonary hypertension are available in 10mg and 20mg strengths, catering to different therapeutic needs.

For adults, the standard dosage is typically 20mg taken three times a day, spaced evenly throughout the day for consistent effect.

When prescribed for children, doses may range from 10mg to 20mg taken three times daily, depending on the child's weight and doctor's recommendation. Always adhere to the specified maximum of three doses per day.

How to take tablets

To take sildenafil tablets, swallow them whole with a full glass of water or juice (excluding grapefruit juice, which can interfere with the medication).

For those taking sildenafil for erectile dysfunction, it's advisable to ingest the tablets on an empty stomach, as food intake might delay its onset of action.

How to take liquid

If you or your child are prescribed sildenafil in liquid form, typically, 1ml is equivalent to a 10mg tablet, but always confirm this on the medication label for accuracy.

Liquid sildenafil is usually prepared specifically for you by your pharmacist, ensuring proper formulation and dosage.

The medicine will be provided with a plastic syringe or dosing spoon for accurate measurement. If you do not have a plastic tool, make sure to request one from your pharmacist to avoid inaccuracies with standard kitchen utensils.

If you forget to take it

In the event that you have pulmonary hypertension and forget your dose of sildenafil, take it as quickly as possible unless it is nearing the scheduled time for your next dose. If that’s the case, skip the missed dose and continue with your usual dosing schedule.

It's crucial never to take two doses simultaneously or to compensate for a missed dose with an extra one, as that could lead to adverse effects.

If missing doses becomes a frequent issue, it might be beneficial to set reminders or alarms as effective solutions. Additionally, your pharmacist can offer strategies to assist you in maintaining a consistent medication routine.

If you take too much

Taking an excessive amount of sildenafil can lead to unpleasant side effects, and prompt action may be necessary.

If you suspect an overdose and are experiencing concerns regarding side effects, it is advisable to contact your doctor immediately. Some potential side effects include:

  • headaches
  • dizziness
  • indigestion
  • blocked nose
  • changes in vision

Page last reviewed: 2 March 2022
Next review due: 2 March 2025